post-natal depression thieving

You might have a small sample if you were using the qualitative method rather than the quantitative.

Anyway, try and be a bit more sympathetic. These men have lost exclusive rights to mummy and need time to adjust

If they want the lable PND could it stand for something else - say 'Please Notice Daddy'

Yes quite. Some of them suffer from a severe attack of nose out of joint, sulking because they aren't having sex and being required to do extra housework!
I once read that the peak time for husbands to "stray' is when their first child had been born.
And there are lots of lovely men that do their absolute best and find it difficult to adjust.
But neither of these should be called post natal depression.